轻钢加层钢筋混凝土框架结构地震反应非线性分析

Nonlinear analysis of seismic response on reinforced concrete frame structure with storey-adding of light-weight steel

利用SAP2000结构有限元分析软件,对一采用轻钢材料加层的框架结构建立三维非线性有限元模型,基于数值模型,对加层后结构的抗震性能进行比较和深入分析。结果表明,加层后结构的固有频率、层间剪力、相对层间位移和层间位移都有显著改变。总体上来说,加层后结构的安全性可以满足现行国家规范要求。

A 3 - dimentional nonlinear finite element model （FEM） is developed by software of SAP2000 to model a reinforced concrete frame structure with storey - adding of light - weight steel, Based on the numerical model, the seismic behaviors on the storey - adding reconstruction project of the reinforced concrete frame structure is investigated and discussed systematically. The dynamic characteristics and the seismic responses of the structure before and after adding stories of light weight steel are compared and analyzed intensively. The results show that the natu- ral frequency, the storey shear force, the relative storey displacement and the inter - storey drift change significant- ly after adding the light - weight steel on the top of the original structure. Generally, the reconstructed frame struc- ture with steel stories meet the relative requirements according to the current national standards.